package com.linkoog.devtools.code_generator.wizard.generate.database.table.model;

/*******************************************************************************
 * @project: JAutoCompleteComboBox
 * @package: test
 * @file: AutoCompleter.java
 * @author: zhangpei
 * @created: 2019-4-18
 * @purpose:
 *
 * @version: 1.0
 *
 * Revision History at the end of file.
 *
 * Copyright 2019 esoon-tech All rights reserved.
 ******************************************************************************/

/**
 * @Title: AutoCompleter.java
 * @Package test
 * @Description: TODO(用一句话描述该文件做什么)
 * @author Burns[张沛]
 * @date 2019-4-18 上午11:47:00
 * @version V1.0
 */

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.List;
import java.util.Vector;

import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JTextField;

/**
 * @ClassName: AutoCompleter
 * @Description: TODO(这里用一句话描述这个类的作用)
 * @author Burns[张沛]
 * @date 2019-4-18 上午11:47:00
 *
 */
/**
 * 自动完成器。自动找到最匹配的项目，并排在列表的最前面。
 *
 * @author Turbo Chen
 */
class AutoCompleter implements KeyListener, ItemListener {

    private JComboBox owner = null;
    private JTextField editor = null;
    private ComboBoxModel model = null;

    public AutoCompleter(JComboBox comboBox) {
        owner = comboBox;
        editor = (JTextField) comboBox.getEditor().getEditorComponent();
        editor.addKeyListener(this);
        model = comboBox.getModel();

        owner.addItemListener(this);
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyPressed(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {
        char ch = e.getKeyChar();
        if (ch == KeyEvent.CHAR_UNDEFINED || Character.isISOControl(ch)
                || ch == KeyEvent.VK_DELETE)
            return;

        int caretPosition = editor.getCaretPosition();
        String str = editor.getText();
        if (str.length() == 0)
            return;
        autoComplete(str, caretPosition);
    }

    /**
     * 自动完成。根据输入的内容，在列表中找到相似的项目.
     */
    protected void autoComplete(String strf, int caretPosition) {
        Object[] opts;
        opts = getMatchingOptions(strf.substring(0, caretPosition));
        if (owner != null) {
            model = new DefaultComboBoxModel(opts);
            owner.setModel(model);
        }
        if (opts.length > 0) {
            String str = opts[0].toString();
            editor.setCaretPosition(caretPosition);
            if (owner != null) {
                try {
                    owner.showPopup();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
    }

    /**
     *
     * 找到相似的项目, 并且将之排列到数组的最前面。
     *
     * @param str
     * @return 返回所有项目的列表。
     */
    protected Object[] getMatchingOptions(String str) {
        List v = new Vector();
        List v1 = new Vector();

        for (int k = 0; k < model.getSize(); k++) {
            Object itemObj = model.getElementAt(k);
            if (itemObj != null) {
                String item = itemObj.toString().toLowerCase();
                if (item.startsWith(str.toLowerCase()))
                    v.add(model.getElementAt(k));
                else
                    v1.add(model.getElementAt(k));
            } else
                v1.add(model.getElementAt(k));
        }
        for (int i = 0; i < v1.size(); i++) {
            v.add(v1.get(i));
        }
        if (v.isEmpty())
            v.add(str);
        return v.toArray();
    }

    public void itemStateChanged(ItemEvent event) {
        if (event.getStateChange() == ItemEvent.SELECTED) {
            int caretPosition = editor.getCaretPosition();
            if (caretPosition != -1) {
                try {
                    editor.moveCaretPosition(caretPosition);
                } catch (IllegalArgumentException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
}

/*******************************************************************************
 * <B>Revision History</B><BR>
 * [type 'revision' and press Alt + / to insert revision block]<BR>
 *
 *
 *
 * Copyright 2019 esoon-tech All rights reserved.
 ******************************************************************************/
